首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1700718篇
  免费   123975篇
  国内免费   3812篇
耳鼻咽喉   21848篇
儿科学   55727篇
妇产科学   46207篇
基础医学   241990篇
口腔科学   48882篇
临床医学   151680篇
内科学   334956篇
皮肤病学   38699篇
神经病学   131503篇
特种医学   64058篇
外国民族医学   242篇
外科学   258016篇
综合类   38964篇
现状与发展   4篇
一般理论   531篇
预防医学   124362篇
眼科学   40429篇
药学   124072篇
  7篇
中国医学   4482篇
肿瘤学   101846篇
  2021年   12886篇
  2019年   13606篇
  2018年   20040篇
  2017年   15270篇
  2016年   16731篇
  2015年   19064篇
  2014年   26344篇
  2013年   38098篇
  2012年   52960篇
  2011年   55681篇
  2010年   32946篇
  2009年   30822篇
  2008年   51787篇
  2007年   55062篇
  2006年   55512篇
  2005年   52833篇
  2004年   51017篇
  2003年   48423篇
  2002年   46635篇
  2001年   91943篇
  2000年   93772篇
  1999年   77108篇
  1998年   19792篇
  1997年   17319篇
  1996年   17439篇
  1995年   16783篇
  1994年   15328篇
  1993年   14101篇
  1992年   57501篇
  1991年   55356篇
  1990年   53071篇
  1989年   50831篇
  1988年   46218篇
  1987年   45018篇
  1986年   42310篇
  1985年   40042篇
  1984年   29406篇
  1983年   24951篇
  1982年   13922篇
  1979年   25576篇
  1978年   17617篇
  1977年   14930篇
  1976年   13904篇
  1975年   14585篇
  1974年   17653篇
  1973年   16966篇
  1972年   15704篇
  1971年   14483篇
  1970年   13468篇
  1969年   12542篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
61.
Infections due to Penicillium species other than P.marneffei are rare. We identified a boy with X-linked chronic granulomatous disease (X-CGD) with a pulmonary nodule and adjacent rib osteomyelitis caused by Penicillium piceum. The only sign of infection was an elevated sedimentation rate. P. piceum was isolated by fine needle aspirate and from excised infected tissues. Surgical removal and one year of voriconazole treatment were very well tolerated and led to complete recovery. Microbiological, microscopic and molecular studies support the fungal diagnosis. P. piceum should be considered as a relevant pathogen in immunocompromised patients.  相似文献   
62.
63.
64.
65.
66.
67.
Although surgical lung resection could improve prognosis in some patients with multidrug-resistant tuberculosis (MDR-TB), there are no reports on the optimal candidates for this surgery. The aim of the present study was to elucidate the prognostic factors for surgery in patients with MDR-TB. Patients who underwent lung resection for the treatment of MDR-TB between March 1993 and December 2004 were included in the present study. Treatment failure was defined as greater than or equal to two of the five cultures recorded in the final 12 months of treatment being positive, any one of the final three cultures being positive, or the patient having died during treatment. The variables that affected treatment outcomes were identified through univariate and multivariate logistic regression analysis. In total, 79 patients with MDR-TB were included in the present study. The treatment outcomes of 22 (27.8%) patients were classified as failure. A body mass index <18.5 kg x m(-2), primary resistance, resistance to ofloxacin and the presence of a cavitary lesion beyond the range of the surgical resection were associated with treatment failure. Low body mass index, primary resistance, resistance to ofloxacin and cavitary lesions beyond the range of resection are possible poor prognostic factors for surgical lung resection in multidrug-resistant tuberculosis patients.  相似文献   
68.
69.
70.
We previously reported poorer survival among non-Hispanic blacks and Hispanics with idiopathic pulmonary fibrosis (IPF) compared to non-Hispanic whites at our center. In the current study, we hypothesized that these disparities would exist in a nationwide cohort of wait-listed patients with IPF. We performed a retrospective cohort study of 2635 patients with IPF listed for lung transplantation between 1995 and 2003 at 94 transplant centers in the United States. The age-adjusted mortality rate was higher among non-Hispanic blacks [hazard ratio (HR) = 1.24, 95% confidence interval (CI) 1.06-1.45, p = 0.009] and Hispanics (HR = 1.29, 95% CI 1.06-1.56, p = 0.01) compared to non-Hispanic whites. These findings persisted after adjustment for transplantation, medical comorbidities and socioeconomic status. Worse lung function at the time of listing appeared to explain some of these differences (HR for non-Hispanic blacks after adjustment for forced vital capacity percent predicted = 1.16, 95% CI 0.98-1.36, p = 0.09; HR for Hispanics = 1.21, 95% CI 0.99-1.48, p = 0.056). In summary, black and Hispanic patients with IPF have worse survival than whites after listing for lung transplant.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号